[Solved] Nullable DateTime/Date template cannot update non-null value with the null(empty) one

[Victoria]

ASP.NET MVC 3
OS: Windows
Browser: Google Chrome 17.0.963.56 m
Telerik: Extensions for ASP.NET MVC Q1 2012
Preferred Language: C# , Razor

Hello,

i am using a nullable Date in my Model:

[DataType(DataType.Date)]
public DateTime? BirthDate { get; set; }

with the following template 

@model DateTime?


@(Html.Telerik().DatePickerFor(m => m)
      .HtmlAttributes(new { id = ViewData.TemplateInfo.GetFullHtmlFieldName(string.Empty) + "_wrapper" })
)

The problem occures when I try to update the date from non-null value (e.g. 8/21/1972) to the empty one. In this case after update the previous non-null value is set instead of the empty one.
Here is the update method in controller:

[AcceptVerbs(HttpVerbs.Post)]
[GridAction]
public ActionResult _Update(int id)
{
    var customer = SessionRepository.One(p => p.Id == id);

    TryUpdateModel(customer);
    SessionRepository.Update(customer);
    return View(new GridModel(SessionRepository.All()));
}

Please, find the sample project attached. Steps to reproduce: try to update any birth date to null (clear it up) and save it.

Please, advise.

Thank you,
Victoria

[Petur Subev]

Hello Victoria,

If the date field is empty then no value is sent to the server. Also the TryUpdateModel method does not update the BirthDate if there is no value provided for that field. 
In such case you can use the following approach:

[AcceptVerbs(HttpVerbs.Post)]
        [GridAction]
        public ActionResult _Update(Customer cust)
        {
            var customer = SessionRepository.One(p => p.Id == cust.Id);

            TryUpdateModel(customer);
            if (cust.BirthDate==null)
            {
                customer.BirthDate = null;
            }
            SessionRepository.Update(customer);
            return View(new GridModel(SessionRepository.All()));
        }

Kind regards,
Petur Subev
the Telerik team

[Victoria]

Hi Petur,

Thank you for your help and quick reply.
Everything is working fine now.

Regards,
Victoria